CN101716818A - Multi-servomotor energy-saving hydraulic circuit - Google Patents
Multi-servomotor energy-saving hydraulic circuit Download PDFInfo
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- CN101716818A CN101716818A CN200910155167A CN200910155167A CN101716818A CN 101716818 A CN101716818 A CN 101716818A CN 200910155167 A CN200910155167 A CN 200910155167A CN 200910155167 A CN200910155167 A CN 200910155167A CN 101716818 A CN101716818 A CN 101716818A
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Abstract
The invention discloses a multi-servomotor energy-saving hydraulic circuit, which is used for a medium-and-large-sized plastic-injection molding machine of which constant flow pumps are driven by a plurality of servomotors. The multi-servomotor energy-saving hydraulic circuit comprises a plurality of constant flow pumps, a plurality of servomotors, a pressure gauge, a pressure sensor, an overflow valve, an oil filter, an air cleaner, a liquid level and temperature gauge and an oil cooler, and is characterized in that: one of the plurality of constant flow pumps is a main servopump; one of the plurality of servomotors is a main servomotor; the main servopump is connected with the main servomotor to form a main servopump loop; other constant flow pumps are connected with other servomotors one by one to form auxiliary servopump loops; and each auxiliary servopump loop is provided with a one-way valve respectively. The multi-servomotor energy-saving hydraulic circuit has better energy-saving effect and higher control precision.
Description
Technical field
The present invention relates to a kind of multi-servomotor energy-saving hydraulic circuit, be applied to the medium-and-large-sized plastic-injection moulding machine of a plurality of driven by servomotor constant displacement pumps.
Background technology
Medium-and-large-sized injection machine needs a plurality of synchronous servo motors to drive the requirement that constant displacement pump satisfies big flow-control, multi-servomotor energy-saving hydraulic circuit of the present invention need to be applied to can realize plastic-injection moulding machine better energy-saving effect and control accuracy than conventional a plurality of driven by servomotor constant displacement pumps in the hydraulic circuit of a plurality of servomotors.
The course of work of plastic-injection moulding machine generally is divided into locked mode, injection, pressurize, cooling, plasticizing, die sinking, ejects, in whole actuation cycle process, required pressure of each stage and changes in flow rate are bigger, and the power consumption value of injection machine also changes with the variation in action cycle.Therefore the power output of servomotor can change with the variation of load, adopts the hydraulic circuit of driven by servomotor constant displacement pump can be effectively energy-conservation.
Traditional servomotor hydraulic circuit, under the situation of a plurality of driven by servomotor constant displacement pumps, being worked simultaneously by a plurality of motors provides required flow of system and pressure, under some action needs situation that seldom flow can satisfy of injection machine, still work together simultaneously by a plurality of motors, cause the portion of energy loss.
What introduced among the Chinese patent ZL200620140718 " energy-saving servo injection molding machine " is the energy-saving hydraulic circuit of single servomotor, this system compares with the present invention, there is significant disadvantages: 1) when the required flow of injection machine system is very big, the also corresponding increase of the discharge capacity of oil pump and the power of servomotor, and select the oil pump of big discharge capacity and powerful servomotor cost obviously to surpass the cost that a plurality of driven by servomotor constant displacement pumps make up, and, also want corresponding increase fuselage height and length because single high-power servomotor volume is also big.2) can not realize a plurality of action synchronous operations, inefficiency 3) multi-servomotor energy-saving hydraulic circuit of the present invention is not traditional a plurality of motor pump simple combination, also divide major-minor hydraulic circuit, combination by check valve, and under the specific function control of control system for shot machine, can be more effective energy-conservation, and the system of being introduced in the file 200620140718-energy-saving servo injection molding machine has only this function of the illegal realization of motor.
Scheme illustrated among the Chinese patent ZL200720118018 " injection machine energy-saving intelligence control system " is not considered a plurality of servomotor pump combination particularity just specially at the hydraulic circuit of single servomotor control pump yet.In a plurality of servomotor pump combinations, if control mode still is the simple rotating speed of dividing equally each servomotor according to the system pressure flow, under some action needs situation that seldom flow can satisfy of injection machine, still work together simultaneously by a plurality of motors, cause the portion of energy loss.And the corresponding a plurality of servo controllers of a plurality of servomotors, if be regardless of major-minorly, be difficult to control, make one to be master controller, the signal and the master controller of all the other controllers are synchronous, can very simple and effective control system.
Summary of the invention
Technical problem to be solved by this invention is to overcome deficiency of the prior art and the multi-servomotor energy-saving hydraulic circuit that a kind of energy-saving effect is better, control accuracy is higher is provided.
The technical scheme that the present invention solves the problems of the technologies described above employing is: this multi-servomotor energy-saving hydraulic circuit, comprise a plurality of constant displacement pumps, a plurality of servomotors, Pressure gauge, pressure sensor, overflow valve, oil filter, air filter, liquid level liquid thermometer and oil cooler, its characteristics are: a constant displacement pump in described a plurality of constant displacement pumps is the main servo pump, a servomotor in a plurality of servomotors is the main servo motor, main servo pump and main servo motor connect and compose main servo blowback road, remaining constant displacement pump and remaining servomotor connect one to one and constitute auxiliary servo blowback road, be respectively arranged with check valve in each auxiliary servo blowback road, main servo blowback road is in parallel with auxiliary servo blowback road.Except main servo blowback road, check valve all is equipped with on all the other auxiliary servo blowback roads among the present invention, and its effect is not work when auxiliary servo blowback road, i.e. auxiliary servo motor stall, auxiliary quantitative air pump inoperative.Because servomotor is not worked suddenly, can realize pressure differential, the oil meeting adverse current in loop is in the constant displacement pump of stall, and check valve can effectively prevent oily adverse current.
Constant displacement pump exit in the auxiliary servo blowback of the present invention road is provided with check valve.
Check valve of the present invention is the plug-in check valve.The effect of adopting the plug-in check valve is only to allow direction of fluid to flow, and can prevent fluid adverse current scavenge oil pump.Inserted valve generally is applied to medium-and-large-sized injection machine, and is strong to loading functional adaptability, realizes easily not having and reveals, and controlled pressure and flow are not subjected to structural limitations, and response is fast, and quiet dynamic characteristic is good, realizes integrated morphology easily.
Advantage of the present invention is: except main servo blowback road, check valve all is equipped with on all the other auxiliary servo blowback roads.In pressure maintaining period, have only the work of main servo blowback road, be used for carrying out pressurize and pressure and discharge, do not work in auxiliary servo blowback road, the servomotor stall in the auxiliary servo blowback road, quantitatively air pump inoperative.Equally, in the whole actuation cycle process of injection machine, ejecting goods, the injection seat reach, injection seat retreats, and the mode transfer action is down, can allow servomotor stall in the auxiliary servo blowback road, quantitative air pump inoperative, main servo blowback road works independently and is used to provide required flow of action and pressure.Therefore this hydraulic circuit system can not only be energy-conservation, can also protect motor, prolongs motor service life.Under the many more situations of the group of motors quantity of using, energy-saving effect is good more.
Description of drawings
Fig. 1 is principle of the invention figure.
The specific embodiment
In conjunction with Fig. 1, the enforcement of multi-servomotor energy-saving hydraulic circuit of the present invention is further described:
Servomotor EM1, EM2, EM3, constant displacement pump PUMP1, PUMP2, PUMP3, check valve V49, V50, Pressure gauge V39, pressure sensor V53, overflow valve (safety valve) V52, oil filter V35, air filter V36, liquid level liquid thermometer V37, oil cooler V38.
Servomotor EM1 is the main servo motor, constant displacement pump PUMP1 is the main servo pump, main servo pump PUMP1 and main servo motor EM1 connect and compose main servo blowback road I, remaining constant displacement pump PUMP2, PUMP3 connect one to one with servomotor EM2, EM3 respectively and constitute auxiliary servo blowback road II, and main servo blowback road I and auxiliary servo blowback road II are connected in parallel.The exit of constant displacement pump PUMP2, PUMP3 is respectively arranged with check valve V49, V50.Check valve V49, V50 are the plug-in check valve.Pressure gauge V39 is connected on the working connection, can display system pressure.Pressure sensor V53 is connected on the working connection, and the system pressure signal feedback that pressure sensor detects is given servo controller, and the corresponding control servomotor of servo controller rotating speed reaches the pressure parameter that controller of plastic injection molding is set.Overflow valve (safety valve) V52 is connected main servo blowback road I and the fuel-displaced meet of auxiliary servo blowback road II, when the force value that system pressure sets above overflow valve, and the overflow valve off-load, the direct oil sump tank of fluid is so play the safeguard protection effect.Oil filter V35 is fixed on the fuel tank, and the pump oil suction through oil filter, can keep cleanliness of hydraulic oil earlier, can prevent to cause oil path failures such as obstruction, wearing and tearing because of fluid has impurity.Oil cooler V38 is connected on the system oil return road, and the fluid oil sump tank can effectively reduce the oil temperature through oil cooler earlier.Liquid level liquid thermometer V37 is fixed on tank surface can show oily temperature oil level.Air filter V36 is connected on the fuel tank can purify fluid, keeps tank pressure and atmospheric pressure balance.
In pressure maintaining period, have only main servo blowback road I work, be used for carrying out pressurize and pressure and discharge, auxiliary servo blowback road II does not work, i.e. servomotor EM2, EM3 stall, constant displacement pump PUMP2, PUMP3 do not work.Because servomotor EM2, EM3 do not work suddenly, can realize pressure differential, the oil meeting adverse current in loop is in constant displacement pump PUMP2, the PUMP3 of stall, and check valve V49, V50 can effectively prevent oily adverse current.Equally, in the whole actuation cycle process of injection machine, ejecting goods, move back on the top, the injection seat reach, injection seat retreats, the mode transfer action can allow servomotor EM2, EM3 stall, constant displacement pump PUMP2, PUMP3 not work down, be that auxiliary servo blowback road II does not work, main servo blowback road I works independently and is used to provide required flow of action and pressure.When quick acting, main servo blowback road I and auxiliary servo blowback road II converge together and move.
Claims (4)
1. multi-servomotor energy-saving hydraulic circuit, comprise a plurality of constant displacement pumps, a plurality of servomotors, Pressure gauge, pressure sensor, overflow valve, oil filter, air filter, liquid level liquid thermometer and oil cooler, it is characterized in that: a constant displacement pump in described a plurality of constant displacement pumps is the main servo pump, a servomotor in a plurality of servomotors is the main servo motor, main servo pump and main servo motor connect and compose main servo blowback road, remaining constant displacement pump and remaining servomotor connect one to one and constitute auxiliary servo blowback road, be respectively arranged with check valve in each auxiliary servo blowback road, main servo blowback road is in parallel with auxiliary servo blowback road.
2. multi-servomotor energy-saving hydraulic circuit according to claim 1 is characterized in that: the constant displacement pump exit in the described auxiliary servo blowback road is provided with check valve.
3. multi-servomotor energy-saving hydraulic circuit according to claim 1 and 2 is characterized in that: described check valve is the plug-in check valve.
4. multi-servomotor energy-saving hydraulic circuit according to claim 1 is characterized in that: the oil-in of described main servo motor and auxiliary servo motor is provided with oil filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910155167A CN101716818A (en) | 2009-12-07 | 2009-12-07 | Multi-servomotor energy-saving hydraulic circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910155167A CN101716818A (en) | 2009-12-07 | 2009-12-07 | Multi-servomotor energy-saving hydraulic circuit |
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| CN101716818A true CN101716818A (en) | 2010-06-02 |
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| CN200910155167A Pending CN101716818A (en) | 2009-12-07 | 2009-12-07 | Multi-servomotor energy-saving hydraulic circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968067A (en) * | 2010-10-24 | 2011-02-09 | 绍兴市肯特机械电子有限公司 | High precision pump control system |
| CN102560839A (en) * | 2012-01-22 | 2012-07-11 | 经纬纺织机械股份有限公司 | Main motor of rapier loom |
| CN102635603A (en) * | 2012-05-02 | 2012-08-15 | 济南东测试验机技术有限公司 | Oil source device for hydraulic system |
| CN104708787A (en) * | 2014-12-30 | 2015-06-17 | 湖南鑫高自动化设备有限公司 | Oil-way control method of injection-stretch-blow molding device |
| CN110779813A (en) * | 2019-10-31 | 2020-02-11 | 桥弘数控科技（上海）有限公司 | Dynamic shear testing machine hydraulic system and large dynamic shear testing machine with same |
-
2009
- 2009-12-07 CN CN200910155167A patent/CN101716818A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968067A (en) * | 2010-10-24 | 2011-02-09 | 绍兴市肯特机械电子有限公司 | High precision pump control system |
| CN102560839A (en) * | 2012-01-22 | 2012-07-11 | 经纬纺织机械股份有限公司 | Main motor of rapier loom |
| CN102635603A (en) * | 2012-05-02 | 2012-08-15 | 济南东测试验机技术有限公司 | Oil source device for hydraulic system |
| CN104708787A (en) * | 2014-12-30 | 2015-06-17 | 湖南鑫高自动化设备有限公司 | Oil-way control method of injection-stretch-blow molding device |
| CN104708787B (en) * | 2014-12-30 | 2017-02-22 | 湖南昊兴机械科技有限公司 | Oil-way control method of injection-stretch-blow molding device |
| CN110779813A (en) * | 2019-10-31 | 2020-02-11 | 桥弘数控科技（上海）有限公司 | Dynamic shear testing machine hydraulic system and large dynamic shear testing machine with same |
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Application publication date: 20100602 |